Sliding-gate valve



2 Sheets-Sheet 1.

(No Model.)

D. BAKER.

. SLIDING GATE VALVE.

No. 559,926. Patented May 12, 1896.

F151. 7 v F1592.

Inventor.

Witnesses: @MMW, I W

ANDREW BVGRAHAM. PHOTUUTHQWASNINGTDN. D c

2 t e e h S r S t e B h S 2 L V .-L RM m T AA B .G Dm D I L S a d 0 M 0 m Patented May 12, 1896;

j Inventor.

WiLnesses:

@427 M lkttornej GRAHAM, PHOT UTNO. WASHINGTON n c UNITED STATES PATENT UFFIQE.

DAVID LAKER, OF SPARROlVS POINT, MARYLAND.

SLIDING-GATE VALVE.

SPECIFICATION forming part of Letters Patent No. 559,926, dated May 12, 1896.

Application filed February 28, 1894. Serial No. 501,187. (No model.) 4

T 0 all whom, it may cancer/2'.-

Be it known that I, DAVID BAKER, of Sparrows Point, county of Baltimore, and State of Maryland, have invented a new and useful Improvement in Sliding-Gate Valves, of which the following is a specification.

My invention relates to cut-off valves for water, steam, &c., and has reference more particularly to what are known as slidinggate valves, comprising a casing containing an opening for the passage of the fluid, which opening is closed by a gate operated from the outside of the casing.

The objects of my invention are to provide for the tight and effectual sealing of the ports by the gate when the latter is closed,and when it is opened to admit of an uninterrupted smooth passage through the same, and this to the end that in either position of the gate access may be readily had to the operatingstem for repairing the same or for other purposes. As a result of this uninterrupted passage, there will be no accumulation of sediment or dirt, so that there will be no danger of obstructions being offered to the closing of the valve after having remained open for a considerable length of time.

With these ends in view my invention consists, first, of an improved form of gate comprising two wedgeshaped sections adapted to be moved together to open and close the valve, and to be moved one with relation to the other when the valve is either in the open or in the closed position and by their wedging action to be seated tightly against the in duction and eduction ports; secondly, in an improved mechanism for operating the sections of the gate as above described.

My invention also consists in the details of construction and combination of parts hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal vertical section through a valve constructed in accordance with myinvention, the valve being shown as opened. Fig. 2 is a similar view, the valve being closed. Fig. 3 is a central transverse vertical section on the line a; a; of Fig. 1. Fig. at is a view of a detail.

Referring to the drawings, A represents a casing having the usual induction and eduction ports, between which a valve gate B slides, and by which the ports and the passage through the casing are closed or opened. The casing is in two sections a a, the section a containing the ports, while the section a" is provided with a valve-stein O, the two sections being bolted together at a The sliding gate is in the form of two sections or plates Z) I), placed face to face, their inner faces being inclined in opposite directions, while their outer faces are straight and parallel, the result of this arrangement being that when the two sections are moved one with relation to theother longitudinally in the proper direction they will act with a wedging effect between the ports in the casing, and be caused to be seated tightly therein. The upper portion of the gate issolid,

while the lower portion is provided with anopening Z) of the sizeand shape of the opening in the casing. It will be seen that under this arrangement, when the gate is in the position shown in Fig. 1, the openinginits lower portion will register with the ports in the easing, and a free and unobstructed passage will be afforded therethrough, the openingin the gate, in fact, constituting a continuation of the two ports. In this way there will be no danger or possibility of an accumulation of dirt or sediment, there being no crevices or spaces within which such dirt can lodge. Further, on account of the fact that the gate is in two sections, it will be seen that, as more fully described hereinafter, by their wedgin g action the gate may be caused to be seated tightly against the ports, both when the valve is opened and when it is closed, as shown in Fig. 2, and the fluid being by this arrangement unable to flow to the operative parts it will readily be seen that access may be had to the stem for the purposes of repairing the same without the necessity of altering the position of the valve in whatever condition it may be at the time.

In order that the gate may be operated to open and close the ports in a convenient manner, and in order that the two sections may he slid one upon the other at the proper times to act with a wedging effect against the ports, the stem 0 is swiveled in the upper section of the casing and has its lower end threaded and screwed into an opening in the section b of the sliding gate. Near their upper ends space.

the two adjacent faces of the section are re eessed, and in these recesses the opposite ends of two plates D are seated, between which plates a nut E is located, being pivotally connected thereto by trunnions 6, extending from the opposite sides of the nut and seated loosely in openings in the two plates. The nut is provided with a threaded central opening through which the stem extends. From this description it will be seen that when the stem is turned the two sections of the gate will be caused to move together as one, owing to their connection with the nut through which the stem extends. In order, however, that the two sections, by the connections described, may be caused to move longitudinally, one with respect to the other, to effect the wedging action referred to, I provide in the space in the casing in which the gate moves two stops F F, which are located, respectively, at the extreme ends of the said These stops are in position to be engaged, respectively, by the two sections when the gate is moved to alternately open and close the ports. The stop 13 at the upper part of the casing is in position to be engaged by the section b, while the stop F at the lower end of the casing is in position to be engaged by the section Z). As a result of this arrangement when the stem is turned to move the gate to open the valve the two sections of the gate will move together until the end of the section I) encounters the stop F, when, on the continued movement of the stem, the nut E will cause the plate D to turn slightly on the trunnions of the nut, which turning action will, through the connection of the plates with the section Z), move the latter upward and cause the same to act against the section b with a wedging effect, and'in this manner the two sections will be seated tightly against the ports, affording a free and smooth passage for the fluid being controlled.

In closing the valve when the stem is first turned the section b will be caused to slide with relation to the section Z), after which both sections will be moved together and will continue until the end of the section Z) encounters the stop F, when the continued movement of the stem will, like in the first instance, cause the nut to tip the plates D and move the section 1) upon the section I) and thus wedge the two together between the ports and effectually close the same.

It will thus be seen that by the peculiar arrangement described the sections of the gate will move together until they arrive at the extreme limits of'their movement, when they will be caused to wedge againstthe ports, so that the sections, both when the valve is closed and when it is opened will be wedged tightly against the ports.

It will be observed that the section Z) is thicker throughout its length than the other section and that in consequence it predominates in weight. As a result of this fact, in cases where the valve is applied to a pipe,

with its operating-stem in a substantially Vertical position, the preponderating section will tend by gravity, when the gate is being moved in either direction, to rock the connections and wedge against the other section, the result being that there will be no possibility of the fluid being controlled gaining access to the operative parts of the valve at any time, either during the movement of the gate or when it is wedged against the seats in a closed or open position.

Having thus described my invention, what I claim isl. The combination of a casing provided with through-ports,a sliding gate therein comprising two sections formed with inclined sn 1'- faces placed face to face and movable relatively longitudinally and formed with perforate and imperforate portions, an operatingstem for the gate, intermediate parts constituting a positive and constant connection between the stem and both sections of the sliding gate, means for arresting the movement of one section when the gate is moved to open the ports and means for arresting the movement of the other section when the gate is moved to close the ports; whereby the continued movement of the unarrested section will cause the gate to be wedged both in its open and closed positions.

2. The combination of a casing provided with through-ports,a sliding gate therein comprising two sections formed with inclined surfaces placed face to face and movable relatively longitudinally and formed with perforate and imperforate portions, an operatingstem, jointed connections between the same and the two sections, constituting a constant and positive connection between said parts, and two stops fixed to the casing at opposite ends of the gate, one of the stops in position to be engaged by one of the sections when the gate is moved to open the ports, and the other stop in position to be engaged'by the other section when the gate is moved to close the ports.

3. The combination of the casing having through-ports, the sliding gate therein comprising two wedge-shaped sections with their inclined surfaces placed face to face having perforate and imperforate portions and movable relatively longitudinally, a threaded operating-stem, a nut encircling the same and a connecting device from the nut to the two sections, said connecting device constructed to rock with respect to the nut; whereby it will cause the two sections to move longitudinally one on the other, and a stop in position to be engaged by one of the sections.

4. The combination of the casing having ports, the sliding gate comprising two wedgeshaped relatively-movable sections, a threaded stem, a nut encircling the same, a plate pivotally connected to said nut and having its ends engaging the two sections, and a stop in position to be engaged by one of the sections.

5. The combination of the casing having ports the sliding gate comprising two wedgeshapedsectionsjrelatively movable,a threaded stern, a nut encircling the same and provided with trunnions, plates mounted on said trunnions and havingtheir ends engaging the two sections respectively, and a stop in position to be engaged by one of said sections.

6. In combination with a casing provided with through-ports and a guiding-passage, a Vertically-sliding gate mounted in said guiding-passage, comprising two sections having inclined surfaces placed face to face, one of said sections preponderating in weight and arranged with its thickest end at the top of the gate opposite the thinner end of the other section, an operating-stem for the gate and rocking connections between the operatingstem and the two sections; whereby during the movement of the gate in either direction the weight of the preponderating section will rock the connections and act to wedge the gate, thereby preventing the access of the fluid under control to the operative parts of the Valve.

In testimony whereof I hereunto set my hand, this 19th day of February, 1894:, in the presence of two attesting witnesses.

DAVID BAKER.

Vitnesses:

FELIX R. SULLIVAN, SIDNEY S. MARTIN. 

